Why is a battery has a chemical reaction?

Answer 1

chemical reaction produce electricity in the battery because the chemical contains negative charges and the bar or rod that goes through the battery contains positive charges so when they mix together they make electricity. when the charges are weak they stop making electricity or they don't make any contact with each other any more so they don't produce electricity anymore and people say that the battery dies out.

Answer 2

In a battery, chemical reactions occur as two half reactions, each half reaction occurring at one of the two principal electrodes of the battery. One of the half reactions is an oxidation and the other is a reduction. One constituent of some part of the electrolyte in the battery that touches both electrode gives up electrons at the anode, thereby being oxidized, and another part of the electrolyte in the battery receives these electrons, through the external circuit that connects the two electrodes in the batter, and thereby becomes reduced. The chemical potential energy that drives the reaction forward is converted into an electrical potential difference between the two electrodes, and this can be used to do work, such as starting a car engine.

Answer 3

It is the chemical reaction that makes the electrons move. The moving electrons are what makes the "power" that you want from the battery in the first place!